JP6309881B2 - Work tools - Google Patents

Description

  The present invention relates to a work tool that performs a machining operation on a workpiece.

  International Publication No. 2007/068535 discloses a rotary hammer having a drive unit and a transmission unit. The rotary hammer includes a housing unit that houses a transmission unit and a housing unit that houses a drive unit. The housing unit that houses the drive unit is formed integrally with the main handle. The housing unit that accommodates the transmission unit and the housing unit that accommodates the drive unit are configured to move relative to each other. The housing unit formed integrally with the main handle provided in the rear end region of the rotary hammer extends to the front end region of the rotary hammer, and an auxiliary handle is attached to the front end region.

International Publication No. 2007/068535

  In the rotary hammer described above, the housing units move relative to each other by a plurality of guide elements provided on the side surface of the housing unit, thereby suppressing vibration transmission to the main handle. The guide element is provided at a plurality of positions apart from each other in the front-rear direction of the rotary hammer, and the movement of the housing unit provided with the main handle and the auxiliary handle is stabilized, but the main handle is integrally formed. The housing unit, that is, the rotary hammer is enlarged. In view of the above-described conventional technology, an object of the present invention is to provide a technique that contributes to downsizing of a work tool in a work tool in which a handle can move relative to a main body.

  The above problems are solved by the present invention. According to the preferable form of the work tool which concerns on this invention, the work tool which drives a front-end tool to the long-axis direction of a front-end tool and performs work is comprised. The work tool includes a motor, a drive mechanism that is driven by the motor to drive the tip tool, a main body housing that houses the motor and the drive mechanism, a handle that is coupled to the main body housing so as to be relatively movable, and a main body And an urging member disposed in an intervening manner between the housing and the handle. The handle is biased in the major axis direction of the tip tool by a biasing member. The handle is in a state of being biased by the biasing member, with respect to the longitudinal direction of the tip tool, at a front position close to the tip portion of the tip tool with respect to the main body housing and a rear position separated from the tip portion of the tip tool. It is configured to be movable between. This reduces the transmission of vibration generated in the main body housing to the handle during operation.

  This handle is connected to the handle base on the opposite side of the tip of the tip tool with respect to the handle base, and the handle base provided close to the tip of the tip tool with respect to the longitudinal direction of the tip tool. A handle cover. The handle base and the handle cover are connected to form a grip portion that is gripped by an operator. In other words, the handle base and the handle cover each constitute part of the grip portion. In general, for example, a switch or a controller is disposed in the handle as a component for driving a work tool. For this reason, the handle is constituted by the handle base and the handle cover, thereby securing an arrangement area for the above components. The handle base functions as a connecting member that is connected to the main body housing, and the handle cover functions as a protective member that protects the components from the outside. The handle base and the handle cover are typically connected by screwing means such as screws and bolts, or by fixing means such as adhesion and welding.

  Furthermore, the work tool is provided so as to extend from the main body housing to between the handle base and the handle cover with respect to the longitudinal direction of the tip tool, and has a rear position defining member that defines a rear position of the handle. The rear position defining member includes, for example, an extending portion extending from the main body housing so as to penetrate the handle base in the long axis direction of the tip tool, and a stopper attached to the extending portion. The stopper suitably includes screw members such as screws, bolts and nuts, and retaining rings such as ring springs. In addition, when applying a screw and a bolt as a stopper, the axial part of a screw or a bolt is comprised as an extension part.

  According to the present invention, the rear position defining member that penetrates the handle base in the longitudinal direction of the tip tool and extends between the handle base and the handle cover and defines the rear position of the handle is provided. That is, the rear position defining member is disposed between the handle base and the handle cover that constitute the grip portion of the handle. By disposing the member that defines the position of the handle inside the handle, components necessary for relative movement of the handle with respect to the main body housing can be collectively arranged. Further, since the handle slides with respect to the main body housing while being urged by the urging member, transmission of vibration generated in the main body housing during the operation to the handle is reduced. As a result, the vibration isolation technology for the steering wheel and the compact technology are compatible.

According to the further form of the working tool which concerns on this invention, the rotation control mechanism which controls relative rotation of the handle | steering-wheel with respect to a main body housing further about the circumference of the major axis direction of a front-end tool is comprised. That is, the handle is movable in the long axis direction of the tip tool with respect to the main body housing, and is provided so as not to rotate around the long axis direction of the tip tool. The rotation restricting mechanism is configured by an extending portion as a rear position defining member. The extending portions are typically provided at positions eccentric from the rotation center of the handle, or are provided at a plurality of positions on a predetermined plane orthogonal to the long axis direction of the tip tool.
According to this aspect, the rotation of the handle around the long axis direction of the tip tool is restricted, and the handle moves in the long axis direction of the tip tool with respect to the main body housing. In particular, during work, vibration in the major axis direction of the tip tool is mainly generated in the main body housing. Therefore, transmission of vibrations generated during work to the handle is effectively reduced.

According to the further form of the working tool which concerns on this invention, the handle base is formed so that a part of main body housing may be covered. Typically, the handle base covers a region (also referred to as a motor housing) that houses the motor in the main body housing. Specifically, the handle base covers the outer surface of the motor housing around the long axis direction of the tip tool. Further, a guide portion for guiding the movement of the handle relative to the main body housing is provided between the main body housing covered by the handle base and the handle base. Typically, the guide portion is constituted by a plurality of guide elements held in the main body housing. For example, the handle base is preferably made of resin, and the guide element is preferably made of a metal pin made of a different material. This metal pin is preferably arranged in parallel to the long axis direction of the tip tool.
According to this aspect, the movement of the handle relative to the main body housing is stabilized by the guide portion. In particular, during work, vibration in the major axis direction of the tip tool is mainly generated in the main body housing. For this reason, the handle is guided in the long axis direction by the guide pin, so that transmission of vibrations generated during work to the handle is effectively reduced.

According to the further form of the work tool which concerns on this invention, the one end part of the urging | biasing member is contact | abutted to a main body housing, and the other end part of the urging | biasing member is arrange | positioned so that it may contact | abut to a handle | steering-wheel cover. Therefore, the urging force of the urging member acts on the main body housing and the handle cover.
According to this embodiment, the urging member is disposed inside the handle. Therefore, the space in the handle is efficiently used.

According to the further form of the working tool which concerns on this invention, as for the motor, the rotating shaft line of an output shaft is arrange | positioned in parallel with the major axis direction of a front-end tool. The rear position defining member is constituted by a brush holder that holds the brush of the motor. That is, the brush holder also functions as a stopper that restricts the rearward movement of the handle. Typically, the brush holder is attached to the main body housing so as to be rotatable around the rotation axis so as to surround the rotation axis of the motor. Therefore, the position of the brush is optimized by rotating the brush holder. Note that the rear position defining member is preferably used not only with the brush holder but also with a stopper such as the above-described screwing member or retaining ring.
According to this aspect, the brush holder that holds the brush of the motor is used as the rear position restricting member. Therefore, the number of parts of the work tool is reduced.

According to the further form of the working tool which concerns on this invention, the auxiliary | assistant handle mounting part which can mount | wear with an auxiliary | assistant handle is attached to the main body housing via the elastic member. The auxiliary handle is provided so as to be removable from the auxiliary handle mounting portion. Therefore, the handle is also referred to as a main handle. The auxiliary handle mounting portion is typically provided outside the cylindrical barrel portion of the main body housing. A rubber member such as an O-ring is preferably used as the elastic member.
According to this aspect, the auxiliary handle is coupled to the main body housing via the elastic member. Therefore, transmission of vibration to the auxiliary handle is reduced.

  ADVANTAGE OF THE INVENTION According to this invention, in the working tool which reduces the vibration transmission with respect to a handle | steering_wheel, the technique which contributes to size reduction of a working tool is provided.

It is sectional drawing which shows the whole structure of the hammer drill which concerns on typical embodiment of this invention. It is sectional drawing which shows the internal mechanism of a hammer drill. It is a disassembled perspective view of a hammer drill. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG. In the hammer drill of FIG. 1, it is a side view which shows the state by which the handle was moved ahead. It is sectional drawing of the hammer drill of FIG. FIG. 10 is a sectional view taken along line XX in FIG. 9. It is the XI-XI sectional view taken on the line of FIG.

  Hereinafter, representative embodiments of the present invention will be described with reference to FIGS. This embodiment will be described using a hand-held hammer drill as an example of an impact tool. As shown in FIG. 1, the hammer drill 100 performs a striking operation in the major axis direction (left and right direction in FIG. 1) and a rotation operation around the major axis direction of the hammer bit 119 attached to the tip region of the main body 101, and This is a hand-held impact tool that performs a chiseling operation and a drilling operation on a workpiece (for example, concrete). This hammer bit 119 is an implementation configuration example corresponding to the “tip tool” in the present invention.

[Overall configuration of hammer drill]
As shown in FIGS. 1 and 2, the hammer drill 100 is mainly composed of a main body portion 101 and a handle portion 109 that form an outline of the hammer drill 100. An auxiliary handle 900 is detachably attached to the hammer drill 100. In the present embodiment, for convenience of explanation, the hammer bit 119 side is defined as the front side and the handgrip 109 side is defined as the rear side with respect to the axial direction of the hammer bit 119 (long axis direction of the hammer drill 100, left-right direction in FIG. 1). To do.

[Main unit]
The main body 101 is mainly composed of a motor housing 103 and a gear housing 105. In the main body 101, the gear housing 105 is disposed on the front side with respect to the axial direction of the hammer bit 119, and the motor housing 103 is disposed on the rear side of the gear housing 105. The motor housing 103 and the gear housing 105 are fixedly connected by fixing means such as screws. The motor housing 103 and the gear housing 105 are fixedly coupled so as not to move relative to each other, whereby a single housing constituting the main body 101 is formed. That is, the motor housing 103 and the gear housing 105 are configured as separate housing bodies for assembling the internal mechanism, and are integrated by a fixing means to form a single housing. The main body 101 is an implementation configuration example corresponding to the “main body housing” in the present invention.

  As shown in FIG. 2, the motor housing 103 houses the electric motor 110. The electric motor 110 is arranged such that the output shaft 111 extends in a direction parallel to the long axis of the hammer bit 119. The electric motor 110 is fixed to the motor housing 103 via a baffle plate by fixing means such as screws. Thereby, the output shaft 111 is supported so that rotation drive is possible. A motor cooling fan 112 is attached to the front end side (front side) of the output shaft 111 and rotates integrally with the output shaft 111. A pinion gear 113 is provided in front of the fan 112 of the output shaft 111. This electric motor 110 is an implementation configuration example corresponding to the “motor” in the present invention.

  As shown in FIGS. 2 and 3, the motor housing 103 is provided with a cylindrical bearing holding portion 104 for holding a bearing that supports the rear end portion of the output shaft 111. The bearing holding portion 104 is provided so as to protrude rearward from the rear surface 103b of the motor housing. A brush unit 114 for holding the brush and switching the position of the brush with respect to the commutator is provided on the outer peripheral portion of the bearing holding portion 104. The brush unit 114 is rotatable around the output shaft 111 (bearing holding portion 104). As shown in FIG. 7, when the operator rotates the brush unit 114 and arranges it at a predetermined position, the rotation direction of the electric motor 110 is switched, and the brush of the commutator is switched with respect to the switched rotation direction. The position is optimized. This brush unit 114 is an implementation configuration example corresponding to the “brush holder” in the present invention.

  As shown in FIG. 2, the gear housing 105 houses the motion conversion mechanism 120, the striking element 140, the rotation transmission mechanism 150, and the tool holder 159. The rotational output of the electric motor 110 is converted into a linear motion by the motion conversion mechanism 120 and then transmitted to the striking element 140, and the hammer bit 119 held by the tool holder 159 via the striking element 140 is moved in the long axis direction. Driven linearly. By driving the hammer bit 119 in the long axis direction, a hammering operation (also referred to as a hammer operation) in which the hammer bit 119 strikes a workpiece is performed. The rotation output of the electric motor 110 is transmitted to the hammer bit 119 after being decelerated by the rotation transmission mechanism 150, and the hammer bit 119 is rotationally driven in the circumferential direction around the major axis direction. As the hammer bit 119 is driven to rotate, the hammer bit 119 performs a drilling operation (also referred to as a drill operation) on the workpiece. The rotation output of the electric motor 110 is transmitted to the motion conversion mechanism 120 and the rotation transmission mechanism 150 via the intermediate shaft 118 supported by the gear housing 105. The motion conversion mechanism 120 and the striking element 140 are an implementation configuration example corresponding to the “drive mechanism” in the present invention.

  As shown in FIG. 2, the motion conversion mechanism 120 is connected to the rotating body 123 disposed on the outer peripheral portion of the intermediate shaft 118, the swing shaft 125 attached to the rotary body 123, and the tip of the swing shaft 125. The piston 127 and the rear region of the tool holder 159 are configured, and a cylinder 129 that houses the piston 127 is mainly used.

  The intermediate shaft 118 is rotated by being engaged with the output shaft 111 of the electric motor 110. The rotating body 123 rotates as the intermediate shaft 118 rotates. As the rotary body 123 is driven to rotate, the rocking shaft 125 is swung in the front-rear direction of the hammer drill 100 (front-rear direction in FIG. 2), whereby the piston 127 reciprocates linearly in the front-rear direction of the hammer drill 100 in the cylinder 129. Is done.

  As shown in FIG. 2, the striking element 140 is mainly composed of a striker 143 as a striker slidably disposed in the piston 127 and an impact bolt 145 disposed in front of the striker 143 and colliding with the striker 143. It is configured. The space inside the piston 127 behind the striker 143 is defined as an air chamber 127a that functions as an air spring.

  When the piston 127 is moved in the front-rear direction by the swing of the swing shaft 125, the air pressure in the air chamber 127a fluctuates, and the striker 143 slides in the piston 127 in the front-rear direction of the hammer drill 100 by the action of the air spring. Move. When the striker 143 is moved forward, the striker 143 collides with the impact bolt 145, and the impact bolt 145 collides with the hammer bit 119 held by the tool holder 159. Thereby, the hammer bit 119 is driven linearly toward the front, and the hammering operation is performed on the workpiece.

  As shown in FIG. 2, the tool holder 159 is a substantially cylindrical member and is integrally connected to the cylinder 129 in a coaxial manner. The tool holder 159 and the cylinder 129 are supported by the gear housing 105 so as to be rotatable around the major axis of the hammer bit 119 by bearings 129a and 129b.

  As shown in FIG. 2, the rotation transmission mechanism 150 includes a gear reduction mechanism including a plurality of gears such as a first gear 151 provided on the intermediate shaft 118 and a second gear 153 engaged with the first gear 151. It is configured as a subject. The second gear 153 is attached to the cylinder 129 and transmits the rotation of the first gear 151 to the cylinder 129. As the cylinder 129 is rotated, the tool holder 159 connected integrally with the cylinder 129 is rotated. Thereby, the hammer bit 119 held by the tool holder 159 is rotationally driven. In other words, the rotation transmission member 150 rotates the hammer bit 119 held by the tool holder 159. Thereby, the hammer bit 119 performs a drilling operation on the workpiece.

  The hammer drill 100 includes a hammer drill mode, a drill mode, and a hammer mode as drive modes. In the hammer drill mode, the hammer bit 119 performs a hammer operation by a long-axis hitting operation and a drill operation by a rotation operation around the long-axis direction. Thereby, a hammer drill operation is performed on the workpiece. In the drill mode, the hammer bit 119 is not subjected to the hammering operation by the striking operation, but only the drilling operation by the rotation operation around the long axis direction. Thereby, a drilling operation is performed on the workpiece. In the hammer mode, the drill operation is not performed by the rotation operation around the major axis of the hammer bit 119, but only the hammer operation by the striking operation is performed. Thereby, a hammering operation is performed on the workpiece. This drive mode switching is performed by a drive mode switching mechanism 190. The drive mode switching mechanism 190 has a switching dial 191 provided on the lower side of the gear housing 105. When the switching dial 191 is operated by an operator, the driving mode switching mechanism 190 is moved from the intermediate shaft 118 according to the selected driving mode. The rotation transmission to the motion conversion mechanism 120 and the rotation transmission mechanism 150 and the interruption of the rotation transmission are switched. A detailed description of the drive mode switching mechanism 190 is omitted.

  As shown in FIG. 2, an auxiliary handle mounting portion 106 to which the auxiliary handle 900 is mounted is provided at the distal end portion of the gear housing 105. The auxiliary handle mounting portion 106 is a substantially cylindrical member made of resin, and is provided so as to cover the barrel portion at the distal end portion of the gear housing 105. The rear end portion of the auxiliary handle mounting portion 106 is supported in contact with the gear housing 105, and the front end portion of the auxiliary handle mounting portion 106 is supported by the gear housing 105 via an O-ring 107. Accordingly, a buffer region 106 a that is separated from the gear housing 105 is provided between the front end portion and the rear end portion of the auxiliary handle mounting portion 106 in the front-rear direction of the hammer drill 100. Therefore, due to the elastic deformation of the O-ring 107, the transmission of vibration to the auxiliary handle 900 mounted on the auxiliary handle mounting portion 106 is reduced. This O-ring 107 is an implementation configuration example corresponding to the “elastic member” in the present invention.

  At the lower end portion of the auxiliary handle mounting portion 106, a protection portion 108 that protrudes below the hammer drill 100 is provided in front of the switching dial 191. When the hammer drill 100 is placed on the ground or the like, the protection unit 108 abuts against the ground or the like, so that the switching dial 191 does not directly hit the ground, and the protection unit 108 thereby protects the switching dial 191.

[Handle]
As shown in FIG. 2, the handle portion 109 has a grip 160 that is gripped by an operator. This handle portion 109 is an implementation configuration example corresponding to the “handle” in the present invention. The grip 160 is provided so as to extend in the vertical direction of the hammer drill 100 in a direction intersecting with the axial direction of the hammer bit 119 (the longitudinal direction of the hammer drill 100). The grip 160 is formed in a cantilever shape, and a power cable 168 for supplying current from an external power source to the electric motor 110 is provided at the tip (lower end) of the grip 160. Further, on the front side of the grip 160, a trigger 165 for switching the ON state and the OFF state of the electric motor 110 is provided.

  As shown in FIGS. 1 and 2, a recessed portion 160 a is provided at the rear end portion of the handle portion 109. The recess 160a is provided below the axis 119A of the hammer bit 119 with respect to the extending direction of the grip 160 (the vertical direction of the hammer drill 100). As a manner of holding the hammer drill 100 by the worker, (1) a first holding manner in which the worker holds the grip 160, and (2) a webbed portion between the thumb and the index finger of the worker abuts against the recess 160a. As described above, there is a second holding mode for gripping the side surface of the handle portion 109. In the second holding mode, the recess 160a is provided below the axis 119A of the hammer bit 119, so that the trigger can be held in a state where the operator holds a region close to the striking axis (axis 119A of the hammer bit 119). The operability of 165 can be improved. That is, when the worker performs the work by pressing the hammer bit 119 against the workpiece, it is preferable that the worker grips the striking axis in order to transmit the pressing force of the worker to the workpiece. On the other hand, in order to operate the trigger 165 provided in the handle part 109 formed in a cantilever shape, it is preferable that the operator holds the handle part 109. In order to satisfy the above two requirements, the recess 160a is provided below the axis 119A of the hammer bit 119. In particular, in the hammer drill 100, since the electric motor 110 is heavy, by providing the recess 160a on the rotation axis of the output shaft 111 of the electric motor 110, the operation can be performed smoothly. In the second holding mode, the trigger 165 is operated by the ring finger and the little finger of the operator's hand.

  As shown in FIGS. 2 and 3, the handle portion 109 is configured mainly with a handle front side portion 161 and a handle rear side portion 162. The handle front side portion 161 and the handle rear side portion 162 are fixedly connected by a screw 163 that passes through the handle rear side portion 162 and is screwed to the connecting portion 161a of the handle front side portion 161, whereby the hollow grip 160 is fixed. It is formed. The handle front side portion 161 and the handle rear side portion 162 are implementation configuration examples corresponding to the “handle base” and the “handle cover” in the present invention, respectively. A trigger switch 166 operated by the trigger 165 is provided in a hollow region (an internal space of the grip 160) between the handle front side portion 161 and the handle rear side portion 162. When the trigger 165 is operated by an operator, the trigger switch 166 switches between driving and stopping of the electric motor 110.

  The front handle portion 161 is provided so that the front region of the front handle portion 161 covers the rear region of the motor housing 103. As shown in FIGS. 3 and 6, four metal guide pins 116 extending in the axial direction of the hammer bit 119 are held on the surface of the motor housing 103. The four guide pins 116 are arranged in a balanced manner at the upper end, lower end, right end, and left end of the motor housing 103, respectively. A guide groove that engages with the guide pin 116 is formed on the inner surface of the handle front side portion 161. Accordingly, the handle front side portion 161 is configured to slide in contact with the guide pin 116. That is, the handle portion 109 can be moved relative to the motor housing 103 in the axial direction of the hammer bit 119 (the longitudinal direction of the hammer drill 100). This guide pin 116 is an implementation structural example corresponding to the "guide part" in this invention.

  As shown in FIG. 2, the bearing holding portion 104 of the motor housing 103 is disposed in a hollow region between the handle front side portion 161 and the handle rear side portion 162, which is a rear region from the handle front side portion 161. That is, the bearing holding portion 104 passes through the handle front side portion 161, and thereby the commutator and the brush unit 114 of the electric motor 110 are arranged in the hollow area of the handle portion 109. A spring receiving portion 104 a is provided at the rear end portion of the bearing holding portion 104. A coil spring 115 is disposed between the bearing holding portion 104 and the handle rear side portion 162 in an intervening manner. Accordingly, the handle rear side portion 162 (handle portion 109) is urged rearward from the motor housing 103 (main body portion 101). This coil spring 115 is an implementation configuration example corresponding to the “biasing member” in the present invention.

  The brush unit 114 is attached to the motor housing 103 with a screw 114a so as to contact the shoulder portion 104b (see FIG. 3) of the bearing holding portion 104 protruding rearward from the rear surface 103b of the motor housing. As a result, as shown in FIG. 4, the brush unit 114 is formed such that a predetermined space is formed between the brush unit 114 and the motor housing rear surface 103b with respect to the axial direction of the hammer bit 119 (left-right direction in FIG. 4). Is spaced apart from the rear surface 103b of the motor housing. The flange portion 161b of the handle front side portion 161 is disposed in this predetermined space. The brush unit 114 is formed with a contact portion 114a protruding forward, and the flange portion 161b (with the handle portion 109 urged rearward from the motor housing 103 by the coil spring 115. The handle front side portion 161) and the contact portion 114a (brush unit 114) contact each other. As a result, the rear position of the handle portion 109 is defined. This brush unit 114 is an implementation structural example corresponding to the “rear position defining member” in the present invention.

  As shown in FIG. 3, the motor housing 103 is formed with a boss portion 103a that protrudes rearward from the rear surface 103b of the motor housing. The boss portion 103 a is formed in the upper portion of the motor housing 103 so as to extend in parallel with the axial direction of the hammer bit 119 above the major axis of the hammer bit 119. Two boss portions 103a are provided symmetrically with respect to the central plane in the left-right direction of the hammer drill 100, which is a plane including the long axis of the hammer bit 119 and the extending axis of the handle portion 109.

  As shown in FIG. 5, the boss portion 103 a passes through the flange portion 161 b of the handle front side portion 161, and the screw 170 is screwed through the washer 171 from the rear side of the handle front side portion 161. This boss part 103a is an implementation structural example corresponding to the "extension part" in this invention. In a state where the handle portion 109 is urged rearward from the motor housing 103 by the coil spring 115, the flange portion 161b (the handle front side portion 161) and the washer 171 contact each other. As a result, the rear position of the handle portion 109 is defined. The washer 171 and the screw 170 are an implementation configuration example corresponding to the “rear position defining member” in the present invention. The flange 161b and the front surface of the connecting portion 161a (the surface on the hammer bit 119 side) form a single plane orthogonal to the axial direction of the hammer bit 119 so as to face the motor housing rear surface 103b.

  As shown in FIG. 2, after the handle front side portion 161 is attached to the motor housing 103 with screws 170, the brush unit 114 is attached to the motor housing 103 with screws 114a. Thereafter, the coil spring 115, the trigger 165, and the trigger switch 166 are disposed between the handle front side portion 161 and the handle rear side portion 162, and the handle rear side portion 162 is attached to the handle front side portion 161 by the screw 163. As a result, the handle portion 109 is assembled to the main body portion 101 (motor housing 103).

  As shown in FIGS. 4 and 5, the rear position of the handle portion 109 is determined by the contact between the flange portion 161b of the handle front side portion 161 and the washer 171 and the contact between the flange portion 161b of the handle front side portion 161 and the brush unit 114. It is prescribed. Note that the washer 171 is not provided, and the rear position of the handle 109 may be defined by the contact between the flange 161b and the screw head of the screw 170.

  The handle portion 109 described above is slidable with respect to the main body portion 101 while being biased by the coil spring 115. That is, the handle portion 109 moves between the rear position shown in FIG. 1 and the front position shown in FIG. As shown in FIG. 1, a clearance of a distance D <b> 1 is provided between the handle portion 109 and the main body portion 101 at the rear position. On the other hand, as shown in FIG. 1, at the front position, a clearance having a distance D2 shorter than the distance D1 is provided between the handle portion 109 and the main body 101. As shown in FIGS. 1 and 8, a bellows portion 102 is provided between the main body portion 101 and the handle portion 109. Thereby, mixing of dust etc. between the main-body part 101 and the handle | steering-wheel part 109 is blocked | prevented.

  As shown in FIGS. 9 to 11, when the coil spring 115 is contracted and the handle portion 109 is located at the front position, the flange portion 161 b of the handle front side portion 161, the motor housing rear surface 103 b, and the connection portion of the handle front side portion 161. 161a and the rear surface 103b of the motor housing abut. That is, the front position of the handle portion 109 is defined by the contact between the flange portion 161b of the handle front side portion 161 and the motor housing rear surface 103b, and the contact between the connection portion 161a of the handle front side portion 161 and the motor housing rear surface 103b.

  In the hammer drill 100 described above, when the trigger 109a is operated, a current is supplied to the electric motor 110, and the motion conversion mechanism 120, the striking element 140, and the rotation transmission are based on the drive mode selected by the drive mode switching mechanism 190. The mechanism 150 is driven. Thereby, the hammer bit 119 held by the tool holder 159 is driven, and a predetermined processing operation is performed. During the hammering operation or the hammer drilling operation, vibration in the axial direction of the hammer bit 119 is mainly generated in the main body 101 by the striking force of the hammer bit 119 and the reaction force from the workpiece. At this time, the handle portion 109 moves in the axial direction of the hammer bit 119 with respect to the main body portion 101, whereby the coil spring 115 expands and contracts, thereby reducing transmission of vibration from the main body portion 101 to the handle portion 109. .

  According to the above-described embodiment, the screw 170 is screwed through the washer 171 to the boss portion 103a that penetrates the handle front side portion 161 and extends between the handle front side portion 161 and the handle rear side portion 162. Thus, a stopper that defines the rear position of the handle portion 109 is configured. That is, with respect to the axial direction of the hammer bit 119, since the rear position defining portion is provided between the handle front side portion 161 and the handle rear side portion 162 that constitute the grip 160 of the handle 109, an increase in the size of the handle portion 109 is suppressed. . As a result, the hammer drill 100 can be made compact.

  Further, according to the present embodiment, the handle portion 109 is moved relative to the main body portion 101 while being urged by the coil spring 115, so that the handle portion 109 of the vibration generated in the main body portion 101 during the operation can be obtained. Transmission is reduced. As a result, both vibration isolation technology and downsizing technology are achieved. The coil spring 115 is disposed in the internal space of the handle portion 109, and the internal space is effectively used.

  In addition, according to the present embodiment, not only the washer 171 and the screw 170 but also the brush unit 114 that holds the brush of the electric motor 110 abuts on the flange portion 161b of the handle front side portion 161 so that the rear position of the handle 109 is changed. Stipulate. That is, the brush unit 114 not only holds the brush but also functions as a stopper.

  Further, according to the present embodiment, all the constituent members constituting the handle portion 109 are assembled from the rear side of the main body portion 101. That is, the handle portion 109 can be assembled to the main body portion 101 from one side, and the workability in assembling the handle portion 109 is improved.

  In the above embodiment, the rear position defining member of the handle 109 is configured by the boss portion 103a, the washer 171 and the screw 170, but is not limited thereto. For example, an external thread may be formed on the outer peripheral portion of the boss portion 103a, and the rear position defining member may be configured by a boss portion 103a and a nut screwed into the boss portion 103a. Further, not only a nut that is screwed into the boss portion 103a, but a ring spring that engages with the boss portion 103a may be provided. Further, the boss portion 103 a is not provided, and a screwing member such as a screw or a bolt extends in the axial direction of the hammer bit 119 so as to penetrate the handle front side portion 161, and is screwed into the motor housing 103. It may be configured. In this case, the heads of the screws and bolts come into contact with the flange portion 161b of the handle front side portion 161 to restrict the rearward movement of the handle 109, thereby forming the direction position defining member.

  In the above embodiment, the hand grip 109 is formed in a cantilever shape extending downward from the motor housing 103, but is not limited thereto. For example, the hand grip 109 may be formed in a loop shape so that the distal end portion of the hand grip 109 is further connected to the motor housing 103.

  In the above embodiment, the output shaft 111 of the electric motor 110 is disposed in parallel to the long axis of the hammer bit 119, but the present invention is not limited to this. For example, the output shaft 111 of the electric motor 110 may be disposed so as to intersect the long axis of the hammer bit 119. In this case, the output shaft 111 and the intermediate shaft 116 are preferably engaged via a bevel gear. The output shaft 111 is preferably arranged so as to be orthogonal to the long axis of the hammer bit 119.

  Moreover, in the above embodiment, although the work tool was comprised as the hammer drill 100, it is not restricted to this. The work tool may be, for example, an electric hammer or a reciprocating saw as long as the tip tool is driven in a predetermined long axis direction.

In view of the gist of the above invention, the working tool according to the present invention can be configured in the following manner. Each aspect is used not only alone or in combination with each other, but also in combination with the invention described in the claims.
(Aspect 1)
A boss hole is formed in the extension part,
The stopper is configured as a screw or bolt that is screwed into the boss hole.
(Aspect 2)
The stopper is configured as a nut that is screwed into the extending portion.
(Aspect 3)
The guide portion is composed of a plurality of guide elements respectively arranged at a plurality of positions in the major axis direction on the outer surface of the main body housing.
(Aspect 4)
The two guide elements are provided symmetrically with respect to a plane including the long axis of the tip tool and the extending axis of the handle.
(Aspect 5)
The main body housing has a handle base penetrating portion that penetrates the handle base,
The biasing member is disposed between the handle base and the handle cover so as to be held between the handle base penetrating portion and the handle cover.
(Aspect 6)
The handle base penetrating portion is formed in a substantially cylindrical shape,
The brush holder is disposed on the outer peripheral portion of the handle base penetration portion so that the handle base penetration portion penetrates the brush holder as the rear position defining member.

(Correspondence between each component of this embodiment and each component of the present invention)
The correspondence between each component of the present embodiment and each component of the present invention is as follows. In addition, this embodiment shows an example of the form for implementing this invention, and this invention is not limited to the structure of this embodiment.
The hammer drill 100 is an example of a configuration corresponding to the “work tool” of the present invention.
The main body 101 is an example of a configuration corresponding to the “main body housing” of the present invention.
The motor housing 103 is an example of a configuration corresponding to the “main body housing” of the present invention.
The gear housing 105 is an example of a configuration corresponding to the “main body housing” of the present invention.
The boss portion 103a is an example of a configuration corresponding to the “rear position defining member” of the present invention.
The boss portion 103a is an example of a configuration corresponding to the “extending portion” of the present invention.
The electric motor 110 is an example of a configuration corresponding to the “motor” of the present invention.
The coil spring 115 is an example of a configuration corresponding to the “biasing member” of the present invention.
The motion conversion mechanism 120 is an example of a configuration corresponding to the “drive mechanism” of the present invention.
The striking element 140 is an example of a configuration corresponding to the “drive mechanism” of the present invention.
The handle portion 109 is an example of a configuration corresponding to the “handle” of the present invention.
The handle front side portion 161 is an example of a configuration corresponding to the “handle” of the present invention.
The handle front side portion 161 is an example of a configuration corresponding to the “handle base” of the present invention.
The handle rear portion 162 is an example of a configuration corresponding to the “handle” of the present invention.
The handle rear portion 162 is an example of a configuration corresponding to the “handle cover” of the present invention.
The screw 170 is an example of a configuration corresponding to the “rear position defining member” of the present invention.
The screw 170 is an example of a configuration corresponding to the “stopper” of the present invention.
The washer 171 is an example of a configuration corresponding to the “rear position defining member” of the present invention.
The washer 171 is an example of a configuration corresponding to the “stopper” of the present invention.
The brush unit 114 is an example of a configuration corresponding to the “brush holder” of the present invention.
The guide pin 116 is an example of a configuration corresponding to the “guide member” of the present invention.
The auxiliary handle mounting portion 106 is an example of a configuration corresponding to the “auxiliary handle mounting portion” of the present invention.
The O-ring 107 is an example of a configuration corresponding to the “elastic member” of the present invention.

DESCRIPTION OF SYMBOLS 100 Hammer drill 101 Main body part 102 Bellows part 103 Motor housing 103a Boss part 103b Motor housing rear surface 104 Bearing holding part 104a Contact part 104b Shoulder part 105 Gear housing 106 Auxiliary handle mounting part 106a Buffer area 107 O-ring 108 Protection part 109 Handle part 110 Electric motor 111 Output shaft 112 Fan 113 Pinion gear 114 Brush unit 114a Screw 115 Bearing 116 Guide pin 118 Intermediate shaft 119 Hammer bit 120 Motion conversion mechanism 123 Rotating body 125 Oscillating shaft 127 Piston 127a Air chamber 129 Cylinder 129a Bearing 129b Bearing 140 Stroke Element 143 Strike 145 Impact bolt 150 Rotation transmission mechanism 151 First gear 153 Second gear 159 Handle holder 160 Grip 161 Handle front portion 161a Connecting portion 161b Flange portion 162 Handle rear portion 163 Screw 165 Trigger 166 Trigger switch 168 Power cable 190 Drive mode switching mechanism 191 Switching dial 900 Auxiliary handle

Claims (7)

A work tool that performs work by driving the tip tool in the long axis direction of the tip tool,
A motor,
A drive mechanism driven by the motor to drive the tip tool;
A body housing that houses the motor and the drive mechanism;
With the biasing member biased in the long-axis direction, the front-side position close to the tip of the tip tool with respect to the main body housing and the rear position separated from the tip in the long-axis direction. A handle that is coupled to be relatively movable, and
The handle is moved between the front position and the rear position while being urged by the urging member, so that transmission of vibration generated in the main body housing during the operation to the handle is reduced. And
The handle has a handle base provided close to the tip portion in the major axis direction, and a handle cover provided on the opposite side of the handle base from the tip portion and connected to the handle base. And,
And a rear position defining member that extends from the main body housing to between the handle base and the handle cover and defines a rear position of the handle with respect to the major axis direction. tool. The work tool according to claim 1,
The rear position defining member is
An extension portion coupled to the main body housing and extending through the handle base in the longitudinal direction;
A work tool comprising a stopper that is connected to the extending portion and contacts the handle so as to restrict the rearward movement of the handle. The work tool according to claim 2,
A rotation restricting mechanism for restricting relative rotation of the handle with respect to the main body housing with respect to the longitudinal direction;
The rotation restricting mechanism is constituted by the extending portion. The work tool according to any one of claims 1 to 3,
The handle base is formed so as to cover a part of the main body housing,
A work tool characterized in that a guide part for guiding the movement of the handle relative to the main body housing is provided between the main body housing covered by the handle base and the handle base. The work tool according to any one of claims 1 to 4,
One end of the urging member is in contact with the main body housing, and the other end of the urging member is disposed in contact with the handle cover. The work tool according to any one of claims 1 to 5,
In the motor, the rotation axis of the output shaft is arranged in parallel to the major axis direction,
The working tool characterized in that the rear position defining member is constituted by a brush holder for holding a brush of the motor. The work tool according to any one of claims 1 to 6,
An operating tool mounting portion to which an auxiliary handle can be mounted is attached to the main body housing via an elastic member.

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